Remove zombie .less files from Workspace in Chrome Dev Tools

Question

Help! I can't delete these files from the Dev Workspace:

• Right click → Delete file brings up a modal dialog, but when I click Ok nothing happens.
• These files don't exist anywhere — I deleted them from Explorer hours ago
• I cleared my browser cache
• I didn't add the files manually. I think they may have been added by the Tincr extension
• I'm not running any extensions currently
• In fact, I deleted my Chrome profile folder and re-installed Chrome (v 33.0.1750.154 m)
• Yes, I rebooted
• These zombie files won't die

P.S. I assure you the files do not exist:

P.P.S. The reason why I need them gone is that they're showing up as active CSS rules in the Elements tab, which is making it impossible to debug CSS issues.

Answer 1

Figured it out. The files in question didn't exist per se, but they did exist in a form: they had been compiled into *.map files: bootstrap.css.map and bootstrap-theme.css.map. Deleting the *.map files removes the zombie *.less files from Chrome Dev Tools. Yay for magic files that get out of sync with the codebase.

See this answer for an explanation of the purpose of *.map files.